planner

## Position Feature Control Frame Dimension Information

This topic displays notes and other information about the Position Feature Control Frame (FCF) dimension.

Rules on Position FCF

Position rules are documented in the "Rules for Using Feature Control Frame Dimensions".

Size Symbol

When choosing circular features to dimension (circles, cylinders, or spheres), you can determine the type of size symbol used on the line that defines the size tolerances for the FCF. By default, the diameter symbol is used:

However, if you want to dimension a feature's size based off its radius instead of its diameter, you can instead choose the radius symbol: R

When you click Create, Planner creates the dimension and calculates the feature's nominal size value and any tolerance values based on the type of symbol in the selected dimension:

- If you chose the diameter symbol, Planner uses the nominal diameter of the feature.

- If you chose the radius symbol, Planner uses one half the nominal diameter of the feature. The tolerance values are the radius tolerances (one half of the diameter tolerances).

For example, the following images show the exact same four circle features dimensioned using the same nominal size and tolerance values, but with different calculations due to the size symbol selected:

Using Diameter for size

Using Radius for size

These values are then used in other areas of Planner, such as the Edit window and the Report window.

Specifying a Projected Tolerance Zone for Position

Sometimes you need to project the tolerance zone beyond the boundaries of the feature. This is typically used with mating parts. You can define a projected tolerance zone for the Position FCF by selecting the projection zone symbol (the letter P within a circle) from the <PZ> compartment. In the <len> compartment, you need to type the height of the projected zone beyond the feature of size. The height value needs to match the maximum height of the mating feature.

Reporting the Local Maximum and Minimum Size

You can report the local maximum and minimum size of an Auto Cylinder feature.

To do this:

1. From the Features list, select an Auto Cylinder feature.

2. From the Feature Control Frame editor area, choose the Position symbol .

3. From the Feature Control Frame options area, from the GD&T standard list, choose ISO 1101 to display the Local Size list.

4. From the Local Size list, choose Local: Max & Min.

5. Click Create.

See "Feature Control Frame Reporting Tables for some visual examples.